A fellow asked me to tie some of these muddler variations for him...he fished with Austin Clark in Quebec (atlantic salmon)...and Clark gave him one of these to swing, but took it back at the end of the day! My customer said it was a very successful fly, thus he wanted some. I googled around for it, and found it in Tony Lolli's "Go-To Flies." So the fly is no secret that I'm divulging.
The key is the long deer hair; it pulses nicely in the water.

Gary

a beautiful pattern!
I see the turkey wing under the deer hair now that you mention it